For the SP 01 Tactical and Shadow just drop to a lower main spring such as a 13# main spring. Anything lower and you'll need more modifications. For creep and break, change out hammer. And to change the reset and take up a new disconnector. If you plan to change out hammer and/or disconnector might as well just pick up one of their packages as all the parts are meant to work together. And while you have the pistol apart might as well also do a polish job to compliment the package. Sent from my SM-N950U using Tapatalk